【摘要】 谱分解技术作为一种解释性处理技术得到了地质、地球物理工作者的广泛关注,如何有效地利用其分频显示功能进行油气检测也成为人们关注的一个焦点。利用Wigner高阶谱具有高时频聚集性的特点,提出了一种基于改进核函数的Wigner双谱对角切片的谱分解技术。即在分析指数型核函数与锥形核函数优缺点的基础上,给出了改进的新核函数,进而采用模糊域核函数滤波法抑制Wigner双谱对角切片的交叉项,并解决了Wigner双谱对角切片的模糊函数中心点校正问题。通过对新的核函数交叉项抑制能力的数值模拟,验证新的核函数对时延轴上的交叉项也能抑制。最后对实际地震数据进行了分频处理,在20Hz低频剖面内的油气有利区表现为强能量显示,与井的钻遇结果一致。更多还原

【Abstract】 Spectral decomposition technique as an interpretative processing technology has been paid extensive attention by many geological and geophysical researchers.The effectively frequency division display function of seismic signals for oil gas detection has also become a focus point.The authors propose a spectrum decomposition technique of Wigner bispectrum diagonal slice with an improved kernel function based on high time-frequency resolution of the Wigner higher order spectrum.According to the advantages and disadvantages of the exponential and the cone-shaped kernel functions,the new improved kernel function is given.Then the kernel function filtering method in fuzzy fields is used to suppress the cross-terms of Wigner bispectrum diagonal slice and the center point of the ambiguity function in Wigner bispectrum diagonal slice is corrected.The numerical simulation shows that the new function can suppress the cross-terms of time-delay axis.Finally,the effectiveness of new technique is verified by indicating the presence of oil and gas area in 20 Hz profile,and in accord with well.更多还原